Method of manufacturing hollow metal rods, bars, and the like.



A. YOUNG & T ROWLANDS.

METHOD OF MANUFACTURING HOLLOW METAL 1100s, BARS, AND THE LIKE.

APPLICATION FILED JAN 7. 1908.

993,631 Patented May 30,1911.

following is a specification. 1

I of hollow metal rods, bars and the like,*and'- Y particularly to those rods 01' bars known UNITED STATES PATENT oFFioE.

ARTHUR YOUNG AND THOMAS ROWLANIDS,-0F SiI-IEFFIELD, ENGLAND.

METHOD OF MANUFACTURING HOLLOW METAIi RODS, BARS, AND THE LIKE.

Specification of Letters Patent. Patented May 30, 1911.

Application filed January 7, 1908. Serial No. 409,711,

To all whom it may, concern:

Be it known that we, ARTHUR YOUNG and THOMAS ROWLANDS, subjects of the King of Great Britain, residing, respectively, at 27 Fosters Buildings, High street, Sheffield, and 944 Ecclesall road, Sheffield, both in the county of York, England, have invented certain new and useful Improvements Relating to the Method of Manufacturing Hollow Metal Rods, Bars, and the Like, of-which the This invention relates to the manufacture generally as hollow drill steel. In the manufacture of hollow steel bars or rods the following method has been proposed :-A steel bar, billet or ingot is formed with a central hole which is filled with ap propriaterefractory material such as siloxicon,fsilica, alumina, or other suitable substance, to serve as'a core and the ends are .Si C I a with its core is then heated and submitted to plugged. Siloxicon is a well-known substance made by heating carbon and silica in an electric furnace'to an extremely high temperature, and its approximate formula is The bar, billet or ingot together of the required dimensions is obtained, after which the core isremoved. This removal of the core has hitherto been effected by a drilling operation. This operation gives rise to considerable trouble, particularly when the diameter of the core is small and consequently difliciilt to remove by drilling, and partly because the core in the course of the rolling operation generally assumes a more i or less oval or irregular cross section, so that parts of it remain in the hole after the drilling. Furthermore the drilling entails a considerable amount of time, and consequently adds to the expense of the -manufacture. Moreover the material of the core is hard. and quickly dulls and wears a drill.

The chief object of "our invention is to overcome the above stated diihculties.

According to our invention the removal of i the core afterthe rolling. operation, is cf fected by means of a fluid which, in the form of a fine jet at'a high pressure, is caused to progressively follow,'a'nd impinge upon the core wherebythe latter is continuously worn d'own or disintegrated and blown out or discharged from the hollow bar. In this manner the hole in the bar, even if it has be ..e mounted in come of oval or irregular section in the course of the rolling operations, will ,rnatically' a form of apparatus adapted for accomplishing the objects aimed at, and Fig. 2 of whichshows diagrammatically a means to progressively enter the fluid conveying-v tube into said hollow steel bar.

' In the exemplary embodiment of the apparatus adapted for carrying the invention into practice, the hollow drill steel or other -hollow rod or bar ais secured in holders 6 b mounted on a suitable standard or support 0 and the plugs usually inserted for retaining the refractory core a during the rolling o erai ions having beenremoVed as'maH tube 03, which-may be of steel, is introduced into the hole or bore 41 The tube d is supported at one end by a block or holder (1 and at the other end is fed forward and guided by rollers d d which may be driven by a suitable motor or other device. The said tube 03 is in communication, by means, of a flexible pipe or tube 6, with a compressed air reservoir f; the aforesaid pipe or tube e being guided and supported by a grooved pulley or sheave rackets 6 carried by the standard a forming a continuation of the standard or support o The compressed air may be supplied to the reservoir f by means of an air compressor 9 operated in any suit able or convenient manner. By these means fluid under pressure such as air is'suppli'ed to the tube d which progressively enters the hollow,drill steel and from which the said fluid issues in the form of a fine jet and impinges upon the core a so that the latter is continuously worn down as herein described, and dischargedfrom the aforesaid hollow rod or bar a and the bore thereof cleared of the said core. The end of the tube d projects into a closed chamber 0 which may be formed or providedwith an aperture 0" arranged in connection with a fan or other ex- "hausting or removing means so as to provide for the removal of the fine particles resulting from the method of removing the core.

In the operation of removing the core it will be understood that, in the arrangement illustrated, the tube d is caused to advance and for this purpose the support 11' may be adapted to-travel alongthe persurface of the support 0'. instead 0 the tubed being adapted for traveling, the hollow drill' steel a may be mounted in such a manner as to be capable of longitudinal -move 1nent thus also effecting a progression of the jet through the tube, and instead of compressed I air any other suitable fluid which will not substantially chemically afi'ect the material of the hollow tube or rod may be used with out departingfrom the spirit and scope of the invention. v

What we claim and desire to secure by Letters Patent of the United States is': Y

1. The method of removing a refractory core from a hollow rod or bar which consists in discharging a jetof a gaseous fluid un- 2. The method of removing a refractory core from a hollow rod or :bfil' which consists in discharging a jet of a gase ous'fluid under pressure directly against the end of said 5 core, progressing said jet through'said rod or v bar as rapidly as said core is disintegrated by the action of said jet, and conveying away the particles of said core as they are delivered from said bar by the action of said 30 jet.

In testimony whereof we aflix our signatures in presence of two Witnesses;

ARTHUR YOUNG. THOMAS ROWLANDS.

'Witnessesr ALion L. JoHNs'roN, JOHN B. HorKINs, 7 -A. C. MANDOTY,

- F. MASTERS. 

